US20240013736A1 - Power supply system for display apparatus - Google Patents
Power supply system for display apparatus Download PDFInfo
- Publication number
- US20240013736A1 US20240013736A1 US18/213,495 US202318213495A US2024013736A1 US 20240013736 A1 US20240013736 A1 US 20240013736A1 US 202318213495 A US202318213495 A US 202318213495A US 2024013736 A1 US2024013736 A1 US 2024013736A1
- Authority
- US
- United States
- Prior art keywords
- voltage
- management circuit
- power management
- range
- buck
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003071 parasitic effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 206010071061 Small intestinal bacterial overgrowth Diseases 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007142 small intestinal bacterial overgrowth Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000872 buffer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3296—Power saving characterised by the action undertaken by lowering the supply or operating voltage
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4291—Arrangements for improving power factor of AC input by using a Buck converter to switch the input current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/072—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps adapted to generate an output voltage whose value is lower than the input voltage
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
Definitions
- the present disclosure relates to a power supply system, and more particularly, to a power supply system for a display apparatus, in which a structure for supplying operating voltages for a display panel is improved.
- a notebook computer or a mobile device may be exemplified as a display apparatus for processing various information and displaying a result thereof on a display panel.
- the display apparatus may include a backlight module which is coupled to the display panel.
- the display apparatus may be configured to use an adapter which converts AC power into DC power and supplies the converted DC power or a battery which provides DC power, as a system power source.
- the system power source is provided to a system board, and the system board may be configured to provide a system voltage and a power supply voltage to a control board.
- the display panel and the backlight module may be configured to receive necessary voltages through the control board.
- a power management circuit is configured in the control board.
- the power management circuit may provide operating voltages for driving the display panel, by using the power supply voltage.
- a driving circuit is configured in the control board.
- the driving circuit may provide a backlight voltage for providing backlight, by using the system voltage.
- the system board should be configured to provide the system voltage and the power supply voltage to the control board through separate power lines and connectors. Accordingly, in the general display apparatus, the system board should be configured to provide two voltages, and the control board should be configured to receive two voltages. Therefore, a power supply system of the display apparatus may be configured such that a system for transferring voltages is complicated.
- the power supply voltage is generated by buck-converting the system voltage to a low level. Therefore, parasitic resistance by the power line and the connector may greatly act on the power supply voltage, and current loss by the parasitic resistance may be caused relatively large, so that the power efficiency of the power supply system may decrease.
- a load may act greatly, and a drop of a power supply voltage having a low level may occur greatly due to a load on a path which transfers the power supply voltage.
- the power efficiency of a power supply system may greatly decrease.
- the power supply voltage generated by buck-converting the system voltage is transferred from the system board to the power management circuit of the control board. Therefore, since a decrease in efficiency by buck-converting is reflected on a decrease in efficiency of generating the operating voltages by the power management circuit of the control board, the overall power conversion efficiency of the power supply system may decrease.
- the present disclosure is directed to a power supply system for a display apparatus that substantially obviates one or more of problems due to limitations and disadvantages described above.
- the present disclosure is to provide a power supply system for a display apparatus, which receives a system voltage by a simple voltage transfer system and is capable of generating a backlight voltage and operating voltages using the system voltage.
- the present disclosure is also to provide a power supply system for a display apparatus, which generates operating voltages using a system voltage of a high level to reduce the influence of a power line and a connector likely to act as parasitic resistance, thereby being capable of reducing voltage loss and improving power efficiency.
- the present disclosure is also to provide a power supply system for a display apparatus, which generates operating voltages using a system voltage of a high level, thereby being capable of reducing influence according to an increase in a system load and improving power conversion efficiency.
- the present disclosure is to provide a power supply system for a display apparatus, in which a control board uses a system voltage of a system board as it is and generates operating voltages using the system voltage and an internal voltage generated by buck-converting in a power management circuit, thereby being capable of reducing power loss and improving power efficiency.
- a power supply system for a display apparatus includes a system board configured to use a system power source and provide a system voltage corresponding to the system power source; and a control board configured to generate a backlight voltage for backlight and operating voltages for display of a screen, by using the system voltage, and output the backlight voltage and the operating voltages.
- a power supply system for a display apparatus includes a driving circuit configured to receive a system voltage and boost the system voltage to provide a backlight voltage for backlight; and a power management circuit configured to receive the system voltage in parallel with the driving circuit, and generate operating voltages for display of a screen, by using the system voltage.
- a system voltage may be transferred from a system board to a control board, and a backlight voltage and operating voltages may be generated using the system voltage. Therefore, according to the aspects of the present disclosure, since the system board and the control board may be configured to transfer only the system voltage, the numbers of required power lines and connectors may be reduced and a voltage transfer system may be simplified.
- the system voltage of a high level may be transferred from the system board to the control board without buck-converting, and the backlight voltage and the operating voltages may be generated using the transferred system voltage.
- advantages are provided in that current loss by parasitic resistance acting in a process in which the system voltage is transferred may be reduced and power efficiency may be improved.
- advantages are provided in that, even in the case of a system in which a load greatly acts, a voltage drop may be suppressed and power efficiency may be improved.
- control board may generate the operating voltages by using the system voltage of the system board as it is without buck-converting.
- advantages are provided in that, when a driving circuit for outputting the backlight voltage and a power management circuit for outputting the operating voltages are implemented in a single chip, since the backlight voltage and the operating voltages may be provided using only the system voltage, it is easy to design the chip, current consumption may be reduced and the power efficiency of a system power source may be improved.
- FIG. 1 is a block diagram illustrating an aspect of a power supply system of a display apparatus in accordance with the present disclosure
- FIG. 2 is a block diagram illustrating an aspect of a control board of FIG. 1 ;
- FIG. 3 is a waveform diagram illustrating a power sequence in FIG. 2 ;
- FIG. 4 is a block diagram illustrating another aspect of the control board of FIG. 1 ;
- FIG. 5 is a waveform diagram illustrating a power sequence in FIG. 4 .
- a display apparatus of the present disclosure may be implemented to use an adapter or a battery as a system power source, such as in a notebook computer or a mobile device, and to include a backlight module and a display panel to display a screen.
- the display apparatus may be implemented to include a system board 10 , a control board 20 , a backlight module 30 and a display panel 40 .
- the system board 10 performs an internal operation using system power provided from an adapter or a battery.
- the system board 10 may be equipped with a processor (not illustrated) for calculation or data processing, may perform an internal operation related with calculation or data processing by the processor, and may provide display data for displaying an internal operation result through a data transmission line (not illustrated) to the control board 20 .
- the system board 10 may be configured to use a system voltage VB corresponding to system power, for the operation of the processor or the like, and may be configured to provide the system voltage VB to the control board 20 through a power line RCN.
- the power line RCN is illustrated as an equivalent resistor to mean that the power line RCN has a parasitic resistance component.
- the control board 20 may receive the system voltage VB and display data (not illustrated) provided from the system board 10 .
- the control board 20 may control generation of a backlight voltage VLED for backlight and operating voltages for the display of a screen, by using the system voltage VB, and may output the backlight voltage VLED and the operating voltages.
- the operating voltages generated by the control board 20 may include a core voltage VCORE, an input and output voltage VIO, driving voltages VDDP and VDDN, a common voltage VCOM, a gate high voltage VGH and a gate low voltage VGL, and the core voltage VCORE among the operating voltages described above may be understood as being used in the control board 20 .
- the control board 20 may control the level of the backlight voltage VLED in correspondence to the display data, and may provide the display data to the display panel 40 . Detailed description for this will be made later with reference to FIG. 2 .
- the backlight module 30 may be configured to provide backlight to the display panel 40 as light sources emit light by the backlight voltage VLED provided from the control board 20 .
- the backlight module 30 may include light sources such as LED light sources (not illustrated)) which emit light by the backlight voltage VLED.
- the display panel 40 is to display a screen by performing an optical shutter operation on backlight in each pixel.
- a display area DA for forming a screen may be formed on a substrate, and pixels (not illustrated) which form columns and rows may be formed in the display area DA.
- the pixels may be formed as thin film transistors.
- the display panel 40 may include a source driver SD and a gate driver GD.
- the source driver SD is to drive source signals to the column lines
- the gate driver GD is to drive gate signals to the row lines.
- the display area DA may display a screen as the source signals of the source driver SD and the gate signals of the gate driver GD are applied to the respective pixels through the column lines and the row lines.
- the source driver SD may receive the display data provided from the control board 20 , and may output the source signals corresponding to the display data to the column lines of the display area DA.
- the gate driver GD may receive a gate control signal provided from the control board 20 , and may output the gate signals to the row lines of the display area DA.
- the source driver SD and the gate driver GD of the display panel 40 require operating voltages for operations, and the operating voltages for the operations of the source driver SD and the gate driver GD may be received from the control board 20 .
- the display panel 40 may receive operating voltages including the input and output voltage VIO, the driving voltages VDDP and VDDN and the common voltage VCOM for the operation of the source driver SD, and may receive the gate high voltage VGH and the gate low voltage VGL for the operation of the gate driver GD.
- control board 20 may be exemplified as including a driving circuit DIC, a power management circuit PMIC, a timing controller TCON and a level shifter LS.
- the control board 20 includes a connector CNT to which the system voltage VB is applied, and the driving circuit DIC and the power management circuit PMIC are connected in parallel to the connector CNT. That is to say, it may be understood that the driving circuit DIC and the power management circuit PMIC receive in parallel the system voltage VB which is transferred to the control board 20 .
- the driving circuit DIC may include a boost circuit or a buck-boost circuit, and may be configured to output the backlight voltage VLED by internally boosting the system voltage VB. Since the boost circuit or the buck-boost circuit which may be included in the driving circuit DIC may be designed using a known technique, detailed exemplification and description thereof will be omitted. For example, the backlight voltage VLED may be outputted to have maximum and minimum levels of a first range substantially the same as the system voltage VB by boosting.
- the timing controller TCON may receive the display data provided from the system board 10 , may obtain brightness information using the display data, and may control the driving circuit DIC using the brightness information to adjust the level of the backlight voltage VLED.
- the timing controller TCON may configure the display data as a packet of a preset protocol, and may transmit the display data to the display panel 40 by providing the packet to the source driver SD.
- the timing controller TCON may generate a gate control signal in synchronization with the display data, and may provide the gate control signal to the gate driver GD. Illustration of wiring lines for signal transmission between the timing controller TCON, the source driver SD and the gate driver GD is omitted in FIGS. 1 and 2 .
- the power management circuit PMIC may receive the system voltage VB in parallel with the driving circuit DIC, and may generate operating voltages using the system voltage VB.
- the power management circuit PMIC may generate an internal voltage VDDPI having maximum and minimum levels of a second range by using the system voltage VB.
- the power management circuit PMIC may generate some operating voltages using the system voltage VB, and may generate the other operating voltages using the internal voltage VDDPI.
- the power management circuit PMIC may include a buck converter BC1.
- the buck converter BC1 may generate the internal voltage VDDPI whose maximum and minimum levels have the second range lower than the first range, by buck-converting the system voltage VB having the maximum and minimum levels of the first range.
- the power management circuit PMIC may include buck converters BC2 and BC3, a buck-boost converter BBC, a programmable converter PVCOM and a gate voltage converter SIBO.
- the power management circuit PMIC may generate the core voltage VCORE, the input and output voltage VIO, the driving voltages VDDP and VDDN, the common voltage VCOM, the gate high voltage VGH and the gate low voltage VGL as the operating voltages.
- the buck converter BC2 may generate the core voltage VCORE whose maximum and minimum levels have a fourth range lower than the second range, by buck-converting the internal voltage VDDPI, and the buck converter BC3 may generate the input and output voltage VIO whose maximum and minimum levels have a third range lower than the second range, by buck-converting the system voltage VB.
- the power management circuit PMIC may be configured to output the core voltage VCORE of the buck converter BC2 and the input and output voltage VIO of the buck converter BC3 to the timing controller TCON.
- the timing controller TCON may use the core voltage VCORE to internally process the display data, and may use the input and output voltage VIO to drive buffers (not illustrated) for reception and transmission of data.
- the core voltage VCORE may be designed to have a level lower than the input and output voltage VIO for low-voltage driving of the timing controller TCON. Therefore, the input and output voltage VIO may be generated such that the maximum and minimum levels have the third range higher than the fourth range of the core voltage VCORE.
- the buck converter BC2 may be configured to generate the core voltage VCORE whose maximum and minimum levels have the fourth range lower than the second range, by buck-converting the system voltage VB.
- the power management circuit PMIC may provide the input and output voltage VIO to the source driver SD of the external display panel 40 , and the source driver SD may use the input and output voltage VIO to receive the display data transmitted in the form of a packet.
- Each of the buck converters BC1, BC2 and BC3 is to buck-convert an input voltage and output a voltage of a level lower than the input voltage, and may be designed to output a voltage corresponding to the input voltage according to an internal gain by a known technique. Thus, detailed exemplification and description thereof will be omitted.
- the power management circuit PMIC may provide the driving voltages VDDP and VDDN and the common voltage VCOM required by the source driver SD, as operating voltages.
- the driving voltages VDDP and VDDN and the common voltage VCOM may be used as voltages for driving a buffer or the like inside the source driver SD.
- the driving voltage VDDP may be outputted by using the internal voltage VDDPI outputted by the buck converter BC1 as it is.
- the driving voltage VDDN may be generated by the buck-boost converter BBC.
- the buck-boost converter BBC may output the driving voltage VDDN which is generated by buck-boost converting the internal voltage VDDPI.
- the driving voltages VDDP and VDDN may be generated to have maximum and minimum levels of the second range the same as the internal voltage VDDPI.
- the common voltage VCOM may be generated by the programmable converter PVCOM.
- the programmable converter PVCOM may generate the common voltage VCOM which is generated by converting the internal voltage VDDPI by applying a gain corresponding to an option value selected among preset option values.
- the common voltage VCOM may be generated to have a medium level between the driving voltages VDDP and VDDN.
- the power management circuit PMIC may generate and provide the gate high voltage VGH and the gate low voltage VGL required by the gate driver GD, as operating voltages.
- the gate high voltage VGH and the gate low voltage VGL may be provided to the gate driver GD to have levels adjusted through the level shifter LS, and the gate driver GD may generate a gate signal using the gate high voltage VGH and the gate low voltage VGL.
- the gate voltage converter SIBO may be configured to generate the gate high voltage VGH and the gate low voltage VGL.
- the gate voltage converter SIBO may be configured to perform one of buck-boost converting and single inductor bipolar output converting. Therefore, by converting the internal voltage VDDPI using one of the buck-boost converting and the single inductor bipolar output converting, the gate voltage converter SIBO may output the gate high voltage VGH and the gate low voltage VGL. Since the buck-boost converting and the single inductor bipolar output converting may be implemented by a known technique, detailed exemplification and description thereof will be omitted.
- the gate high voltage VGH may be outputted such that maximum and minimum levels correspond to a fifth range higher than the second range.
- the gate low voltage VGL may be outputted such that maximum and minimum levels correspond to a sixth range higher than the second range.
- the power management circuit PMIC may generate the operating voltages required in the timing controller TCON and the source driver SD and the gate driver GD of the display panel 40 , by using the system voltage VB and the internal voltage VDDPI.
- only the system voltage VB is transferred to the control board 20 , and the control board 20 may generate the operating voltages using the system voltage VB.
- the operating voltages may be generated by using the system voltage VB used in the system board 10 as it is in the control board 20 .
- the operating voltages may be generated by using the system voltage VB of a relatively high level to which efficiency loss according to power conversion in the system board 10 is not applied. Accordingly, in the aspect of the present disclosure, advantages are provided in that current loss by the action of parasitic resistance may be reduced and power efficiency may be improved. In particular, advantages are provided in that, even in the case of a system in which a large load acts, the aspect of the present disclosure may suppress a voltage drop and improve system efficiency by using the system voltage VB of a relatively high level.
- the driving circuit DIC which outputs a backlight voltage VLED and the power management circuit PMIC which outputs operating voltages are implemented as one chip, since the backlight voltage VLED and the operating voltages may be provided using only a system voltage VB, current consumption may be reduced and the power efficiency of a system power source may be improved.
- the operating voltages may be provided to have a power sequence as shown in FIG. 3 .
- the input and output voltage VIO and the core voltage VCORE which are operating voltages generated by buck-converting the system voltage VB may be activated at preset timings.
- the driving voltage VDDP may be activated at the same time point as the internal voltage VDDPI.
- the internal voltage VDDPI may be activated at a timing earlier than the input and output voltage VIO and the core voltage VCORE.
- the driving voltage VDDN, the gate high voltage VGH and the gate low voltage VGL which are generated by the internal voltage VDDPI may be activated in a preset order at timings later than the driving voltage VDDP.
- FIG. 3 may be understood as an example for satisfying a sequence in which the driving voltage VDDP is activated earlier than the input and output voltage VIO.
- the present disclosure may be implemented as shown in FIG. 4 .
- FIG. 4 An aspect of FIG. 4 is not different from FIG. 2 except that a switch SW for outputting the internal voltage VDDPI as the driving voltage VDDP is added. Accordingly, since the configuration and operation of the aspect of FIG. 4 may be understood by referring to FIG. 2 , repeated description therefor will be omitted.
- the switch SW may output the internal voltage VDDPI as the driving voltage VDDP at a turn-on time point.
- operating voltages may be provided to have a power sequence as shown in FIG. 5 .
- the switch SW may be turned on after the input and output voltage VIO is activated.
- the driving voltage VDDN, the gate high voltage VGH and the gate low voltage VGL which are generated by the internal voltage VDDPI may be activated in a preset order at timings the same as or later than the driving voltage VDDP.
- FIGS. 4 and 5 may satisfy the power sequence in which the driving voltage VDDP is activated after the input and output voltage VIO is activated.
- FIGS. 4 and 5 provide an advantage in that a diversified power sequence may be satisfied.
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Description
- This application claims the priority of Korean Patent Application No. 10-2022-0082776 filed on Jul. 5, 2022, which is hereby incorporated by reference in its entirety.
- The present disclosure relates to a power supply system, and more particularly, to a power supply system for a display apparatus, in which a structure for supplying operating voltages for a display panel is improved.
- A notebook computer or a mobile device may be exemplified as a display apparatus for processing various information and displaying a result thereof on a display panel. When a screen is displayed using a liquid crystal display apparatus, the display apparatus may include a backlight module which is coupled to the display panel.
- The display apparatus may be configured to use an adapter which converts AC power into DC power and supplies the converted DC power or a battery which provides DC power, as a system power source. The system power source is provided to a system board, and the system board may be configured to provide a system voltage and a power supply voltage to a control board. The display panel and the backlight module may be configured to receive necessary voltages through the control board.
- A power management circuit is configured in the control board. The power management circuit may provide operating voltages for driving the display panel, by using the power supply voltage. A driving circuit is configured in the control board. The driving circuit may provide a backlight voltage for providing backlight, by using the system voltage.
- In the above configuration, the system board should be configured to provide the system voltage and the power supply voltage to the control board through separate power lines and connectors. Accordingly, in the general display apparatus, the system board should be configured to provide two voltages, and the control board should be configured to receive two voltages. Therefore, a power supply system of the display apparatus may be configured such that a system for transferring voltages is complicated.
- The power supply voltage is generated by buck-converting the system voltage to a low level. Therefore, parasitic resistance by the power line and the connector may greatly act on the power supply voltage, and current loss by the parasitic resistance may be caused relatively large, so that the power efficiency of the power supply system may decrease.
- In particular, in a system requiring a high-resolution operation such as a gaming operation and a high-frequency operation, a load may act greatly, and a drop of a power supply voltage having a low level may occur greatly due to a load on a path which transfers the power supply voltage. As a result, the power efficiency of a power supply system may greatly decrease.
- The power supply voltage generated by buck-converting the system voltage is transferred from the system board to the power management circuit of the control board. Therefore, since a decrease in efficiency by buck-converting is reflected on a decrease in efficiency of generating the operating voltages by the power management circuit of the control board, the overall power conversion efficiency of the power supply system may decrease.
- The above information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form prior art that is already known to a person of ordinary skill in the art.
- Accordingly, the present disclosure is directed to a power supply system for a display apparatus that substantially obviates one or more of problems due to limitations and disadvantages described above.
- Additional features and advantages of the disclosure will be set forth in the description which follows and in part will be apparent from the description, or may be learned by practice of the disclosure. Other advantages of the present disclosure will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
- More specifically, the present disclosure is to provide a power supply system for a display apparatus, which receives a system voltage by a simple voltage transfer system and is capable of generating a backlight voltage and operating voltages using the system voltage.
- The present disclosure is also to provide a power supply system for a display apparatus, which generates operating voltages using a system voltage of a high level to reduce the influence of a power line and a connector likely to act as parasitic resistance, thereby being capable of reducing voltage loss and improving power efficiency.
- The present disclosure is also to provide a power supply system for a display apparatus, which generates operating voltages using a system voltage of a high level, thereby being capable of reducing influence according to an increase in a system load and improving power conversion efficiency.
- Further, the present disclosure is to provide a power supply system for a display apparatus, in which a control board uses a system voltage of a system board as it is and generates operating voltages using the system voltage and an internal voltage generated by buck-converting in a power management circuit, thereby being capable of reducing power loss and improving power efficiency.
- To achieve these and other advantages and in accordance with the present disclosure, as embodied and broadly described, a power supply system for a display apparatus includes a system board configured to use a system power source and provide a system voltage corresponding to the system power source; and a control board configured to generate a backlight voltage for backlight and operating voltages for display of a screen, by using the system voltage, and output the backlight voltage and the operating voltages.
- In another aspect of the present disclosure, a power supply system for a display apparatus includes a driving circuit configured to receive a system voltage and boost the system voltage to provide a backlight voltage for backlight; and a power management circuit configured to receive the system voltage in parallel with the driving circuit, and generate operating voltages for display of a screen, by using the system voltage.
- According to various aspects of the present disclosure, a system voltage may be transferred from a system board to a control board, and a backlight voltage and operating voltages may be generated using the system voltage. Therefore, according to the aspects of the present disclosure, since the system board and the control board may be configured to transfer only the system voltage, the numbers of required power lines and connectors may be reduced and a voltage transfer system may be simplified.
- Also, according to various aspects of the present disclosure, the system voltage of a high level may be transferred from the system board to the control board without buck-converting, and the backlight voltage and the operating voltages may be generated using the transferred system voltage. Thus, according to the aspects of the present disclosure, advantages are provided in that current loss by parasitic resistance acting in a process in which the system voltage is transferred may be reduced and power efficiency may be improved. In particular, advantages are provided in that, even in the case of a system in which a load greatly acts, a voltage drop may be suppressed and power efficiency may be improved.
- Further, according to the aspects of the present disclosure, the control board may generate the operating voltages by using the system voltage of the system board as it is without buck-converting. Hence, according to the aspects of the present disclosure, advantages are provided in that it is possible to prevent power efficiency from decreasing according to voltage conversion.
- Moreover, according to the aspects of the present disclosure, advantages are provided in that, when a driving circuit for outputting the backlight voltage and a power management circuit for outputting the operating voltages are implemented in a single chip, since the backlight voltage and the operating voltages may be provided using only the system voltage, it is easy to design the chip, current consumption may be reduced and the power efficiency of a system power source may be improved.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed.
- The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the disclosure, illustrate aspects of the disclosure and together with the description serve to explain the principle of the disclosure.
- In the drawings:
-
FIG. 1 is a block diagram illustrating an aspect of a power supply system of a display apparatus in accordance with the present disclosure; -
FIG. 2 is a block diagram illustrating an aspect of a control board ofFIG. 1 ; -
FIG. 3 is a waveform diagram illustrating a power sequence inFIG. 2 ; -
FIG. 4 is a block diagram illustrating another aspect of the control board ofFIG. 1 ; and -
FIG. 5 is a waveform diagram illustrating a power sequence inFIG. 4 . - Reference will now be made in detail to the aspects of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
- A display apparatus of the present disclosure may be implemented to use an adapter or a battery as a system power source, such as in a notebook computer or a mobile device, and to include a backlight module and a display panel to display a screen.
- In more detail, as illustrated in
FIG. 1 , the display apparatus may be implemented to include asystem board 10, acontrol board 20, abacklight module 30 and adisplay panel 40. - An aspect of a power supply system for the display apparatus according to the present disclosure is improved in a structure which transfers power in the display apparatus. Therefore, drawings for explaining the aspect of the present disclosure exemplify a configuration for transferring power, and the illustration and description of parts and transmission lines for transmitting display data among respective components in the drawings are omitted.
- In the aspect of the present disclosure, the
system board 10 performs an internal operation using system power provided from an adapter or a battery. - In the case of a notebook computer or a mobile device, the
system board 10 may be equipped with a processor (not illustrated) for calculation or data processing, may perform an internal operation related with calculation or data processing by the processor, and may provide display data for displaying an internal operation result through a data transmission line (not illustrated) to thecontrol board 20. - The
system board 10 may be configured to use a system voltage VB corresponding to system power, for the operation of the processor or the like, and may be configured to provide the system voltage VB to thecontrol board 20 through a power line RCN. InFIG. 1 , the power line RCN is illustrated as an equivalent resistor to mean that the power line RCN has a parasitic resistance component. - The
control board 20 may receive the system voltage VB and display data (not illustrated) provided from thesystem board 10. - The
control board 20 may control generation of a backlight voltage VLED for backlight and operating voltages for the display of a screen, by using the system voltage VB, and may output the backlight voltage VLED and the operating voltages. - The operating voltages generated by the
control board 20 may include a core voltage VCORE, an input and output voltage VIO, driving voltages VDDP and VDDN, a common voltage VCOM, a gate high voltage VGH and a gate low voltage VGL, and the core voltage VCORE among the operating voltages described above may be understood as being used in thecontrol board 20. - The
control board 20 may control the level of the backlight voltage VLED in correspondence to the display data, and may provide the display data to thedisplay panel 40. Detailed description for this will be made later with reference toFIG. 2 . Thebacklight module 30 may be configured to provide backlight to thedisplay panel 40 as light sources emit light by the backlight voltage VLED provided from thecontrol board 20. Thebacklight module 30 may include light sources such as LED light sources (not illustrated)) which emit light by the backlight voltage VLED. - The
display panel 40 is to display a screen by performing an optical shutter operation on backlight in each pixel. - To this end, in the
display panel 40, a display area DA for forming a screen may be formed on a substrate, and pixels (not illustrated) which form columns and rows may be formed in the display area DA. For example, the pixels may be formed as thin film transistors. - The
display panel 40 may include a source driver SD and a gate driver GD. The source driver SD is to drive source signals to the column lines, and the gate driver GD is to drive gate signals to the row lines. - The display area DA may display a screen as the source signals of the source driver SD and the gate signals of the gate driver GD are applied to the respective pixels through the column lines and the row lines.
- In the
display panel 40, for example, the source driver SD may receive the display data provided from thecontrol board 20, and may output the source signals corresponding to the display data to the column lines of the display area DA. Also, for example, the gate driver GD may receive a gate control signal provided from thecontrol board 20, and may output the gate signals to the row lines of the display area DA. - The source driver SD and the gate driver GD of the
display panel 40 require operating voltages for operations, and the operating voltages for the operations of the source driver SD and the gate driver GD may be received from thecontrol board 20. In more detail, thedisplay panel 40 may receive operating voltages including the input and output voltage VIO, the driving voltages VDDP and VDDN and the common voltage VCOM for the operation of the source driver SD, and may receive the gate high voltage VGH and the gate low voltage VGL for the operation of the gate driver GD. - The generation and output of the backlight voltage VLED and operating voltages through using the system voltage VB by the
control board 20 will be described below with reference toFIG. 2 . - As illustrated in
FIG. 2 , thecontrol board 20 may be exemplified as including a driving circuit DIC, a power management circuit PMIC, a timing controller TCON and a level shifter LS. - The
control board 20 includes a connector CNT to which the system voltage VB is applied, and the driving circuit DIC and the power management circuit PMIC are connected in parallel to the connector CNT. That is to say, it may be understood that the driving circuit DIC and the power management circuit PMIC receive in parallel the system voltage VB which is transferred to thecontrol board 20. - The driving circuit DIC may include a boost circuit or a buck-boost circuit, and may be configured to output the backlight voltage VLED by internally boosting the system voltage VB. Since the boost circuit or the buck-boost circuit which may be included in the driving circuit DIC may be designed using a known technique, detailed exemplification and description thereof will be omitted. For example, the backlight voltage VLED may be outputted to have maximum and minimum levels of a first range substantially the same as the system voltage VB by boosting.
- The timing controller TCON may receive the display data provided from the
system board 10, may obtain brightness information using the display data, and may control the driving circuit DIC using the brightness information to adjust the level of the backlight voltage VLED. - The timing controller TCON may configure the display data as a packet of a preset protocol, and may transmit the display data to the
display panel 40 by providing the packet to the source driver SD. The timing controller TCON may generate a gate control signal in synchronization with the display data, and may provide the gate control signal to the gate driver GD. Illustration of wiring lines for signal transmission between the timing controller TCON, the source driver SD and the gate driver GD is omitted inFIGS. 1 and 2 . - As described above, the power management circuit PMIC may receive the system voltage VB in parallel with the driving circuit DIC, and may generate operating voltages using the system voltage VB.
- In more detail, the power management circuit PMIC may generate an internal voltage VDDPI having maximum and minimum levels of a second range by using the system voltage VB. The power management circuit PMIC may generate some operating voltages using the system voltage VB, and may generate the other operating voltages using the internal voltage VDDPI.
- To this end, the power management circuit PMIC may include a buck converter BC1. The buck converter BC1 may generate the internal voltage VDDPI whose maximum and minimum levels have the second range lower than the first range, by buck-converting the system voltage VB having the maximum and minimum levels of the first range.
- To generate the operating voltages, the power management circuit PMIC may include buck converters BC2 and BC3, a buck-boost converter BBC, a programmable converter PVCOM and a gate voltage converter SIBO.
- By the above configuration, the power management circuit PMIC may generate the core voltage VCORE, the input and output voltage VIO, the driving voltages VDDP and VDDN, the common voltage VCOM, the gate high voltage VGH and the gate low voltage VGL as the operating voltages.
- In more detail, the buck converter BC2 may generate the core voltage VCORE whose maximum and minimum levels have a fourth range lower than the second range, by buck-converting the internal voltage VDDPI, and the buck converter BC3 may generate the input and output voltage VIO whose maximum and minimum levels have a third range lower than the second range, by buck-converting the system voltage VB.
- The power management circuit PMIC may be configured to output the core voltage VCORE of the buck converter BC2 and the input and output voltage VIO of the buck converter BC3 to the timing controller TCON.
- By the above configuration, the timing controller TCON may use the core voltage VCORE to internally process the display data, and may use the input and output voltage VIO to drive buffers (not illustrated) for reception and transmission of data.
- The core voltage VCORE may be designed to have a level lower than the input and output voltage VIO for low-voltage driving of the timing controller TCON. Therefore, the input and output voltage VIO may be generated such that the maximum and minimum levels have the third range higher than the fourth range of the core voltage VCORE.
- Meanwhile, according to a fabricator's convenience, the buck converter BC2 may be configured to generate the core voltage VCORE whose maximum and minimum levels have the fourth range lower than the second range, by buck-converting the system voltage VB.
- The power management circuit PMIC may provide the input and output voltage VIO to the source driver SD of the
external display panel 40, and the source driver SD may use the input and output voltage VIO to receive the display data transmitted in the form of a packet. - Each of the buck converters BC1, BC2 and BC3 is to buck-convert an input voltage and output a voltage of a level lower than the input voltage, and may be designed to output a voltage corresponding to the input voltage according to an internal gain by a known technique. Thus, detailed exemplification and description thereof will be omitted.
- The power management circuit PMIC may provide the driving voltages VDDP and VDDN and the common voltage VCOM required by the source driver SD, as operating voltages. The driving voltages VDDP and VDDN and the common voltage VCOM may be used as voltages for driving a buffer or the like inside the source driver SD.
- The driving voltage VDDP may be outputted by using the internal voltage VDDPI outputted by the buck converter BC1 as it is.
- The driving voltage VDDN may be generated by the buck-boost converter BBC. The buck-boost converter BBC may output the driving voltage VDDN which is generated by buck-boost converting the internal voltage VDDPI.
- The driving voltages VDDP and VDDN may be generated to have maximum and minimum levels of the second range the same as the internal voltage VDDPI.
- The common voltage VCOM may be generated by the programmable converter PVCOM. The programmable converter PVCOM may generate the common voltage VCOM which is generated by converting the internal voltage VDDPI by applying a gain corresponding to an option value selected among preset option values. The common voltage VCOM may be generated to have a medium level between the driving voltages VDDP and VDDN.
- The power management circuit PMIC may generate and provide the gate high voltage VGH and the gate low voltage VGL required by the gate driver GD, as operating voltages. The gate high voltage VGH and the gate low voltage VGL may be provided to the gate driver GD to have levels adjusted through the level shifter LS, and the gate driver GD may generate a gate signal using the gate high voltage VGH and the gate low voltage VGL.
- The gate voltage converter SIBO may be configured to generate the gate high voltage VGH and the gate low voltage VGL. The gate voltage converter SIBO may be configured to perform one of buck-boost converting and single inductor bipolar output converting. Therefore, by converting the internal voltage VDDPI using one of the buck-boost converting and the single inductor bipolar output converting, the gate voltage converter SIBO may output the gate high voltage VGH and the gate low voltage VGL. Since the buck-boost converting and the single inductor bipolar output converting may be implemented by a known technique, detailed exemplification and description thereof will be omitted.
- The gate high voltage VGH may be outputted such that maximum and minimum levels correspond to a fifth range higher than the second range. The gate low voltage VGL may be outputted such that maximum and minimum levels correspond to a sixth range higher than the second range.
- As in the above-described aspect of
FIG. 2 , the power management circuit PMIC may generate the operating voltages required in the timing controller TCON and the source driver SD and the gate driver GD of thedisplay panel 40, by using the system voltage VB and the internal voltage VDDPI. - In the aspect of the present disclosure described above with reference to
FIGS. 1 and 2 , only the system voltage VB is transferred to thecontrol board 20, and thecontrol board 20 may generate the operating voltages using the system voltage VB. - Therefore, only a power line and a connector for transferring the system voltage VB are required between the
system board 10 and thecontrol board 20. Thus, a configuration and a system for transferring a voltage from thesystem board 10 to thecontrol board 20 may be simplified. - In the aspect of the present disclosure, the operating voltages may be generated by using the system voltage VB used in the
system board 10 as it is in thecontrol board 20. - Hence, in the aspect of the present disclosure, the operating voltages may be generated by using the system voltage VB of a relatively high level to which efficiency loss according to power conversion in the
system board 10 is not applied. Accordingly, in the aspect of the present disclosure, advantages are provided in that current loss by the action of parasitic resistance may be reduced and power efficiency may be improved. In particular, advantages are provided in that, even in the case of a system in which a large load acts, the aspect of the present disclosure may suppress a voltage drop and improve system efficiency by using the system voltage VB of a relatively high level. - In particular, in the aspect of the present disclosure, when the driving circuit DIC which outputs a backlight voltage VLED and the power management circuit PMIC which outputs operating voltages are implemented as one chip, since the backlight voltage VLED and the operating voltages may be provided using only a system voltage VB, current consumption may be reduced and the power efficiency of a system power source may be improved.
- By the aspect of the present disclosure having the above-described advantages, the operating voltages may be provided to have a power sequence as shown in
FIG. 3 . - In the case of
FIG. 3 , the input and output voltage VIO and the core voltage VCORE which are operating voltages generated by buck-converting the system voltage VB may be activated at preset timings. When the internal voltage VDDPI is activated by the system voltage VB, the driving voltage VDDP may be activated at the same time point as the internal voltage VDDPI. The internal voltage VDDPI may be activated at a timing earlier than the input and output voltage VIO and the core voltage VCORE. - The driving voltage VDDN, the gate high voltage VGH and the gate low voltage VGL which are generated by the internal voltage VDDPI may be activated in a preset order at timings later than the driving voltage VDDP.
-
FIG. 3 may be understood as an example for satisfying a sequence in which the driving voltage VDDP is activated earlier than the input and output voltage VIO. - Unlike this, a sequence in which the driving voltage VDDP is activated later than the input and output voltage VIO may be required. To this end, the present disclosure may be implemented as shown in
FIG. 4 . - An aspect of
FIG. 4 is not different fromFIG. 2 except that a switch SW for outputting the internal voltage VDDPI as the driving voltage VDDP is added. Accordingly, since the configuration and operation of the aspect ofFIG. 4 may be understood by referring toFIG. 2 , repeated description therefor will be omitted. - The switch SW may output the internal voltage VDDPI as the driving voltage VDDP at a turn-on time point.
- By the aspect of
FIG. 4 , operating voltages may be provided to have a power sequence as shown inFIG. 5 . - In other words, when a sequence in which the driving voltage VDDP is activated later than the input and output voltage VIO is required, the switch SW may be turned on after the input and output voltage VIO is activated.
- The driving voltage VDDN, the gate high voltage VGH and the gate low voltage VGL which are generated by the internal voltage VDDPI may be activated in a preset order at timings the same as or later than the driving voltage VDDP.
- As described above, the aspect of
FIGS. 4 and 5 may satisfy the power sequence in which the driving voltage VDDP is activated after the input and output voltage VIO is activated. - Accordingly,
FIGS. 4 and 5 provide an advantage in that a diversified power sequence may be satisfied. - It will be apparent to those skilled in the art that various modifications and variations can be made in the power supply system for the display apparatus of the present disclosure without departing from the spirit or scope of the aspects. Thus, it is intended that the present disclosure covers the modifications and variations of the aspects provided they come within the scope of the appended claims and their equivalents.
Claims (16)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020220082776A KR20240005538A (en) | 2022-07-05 | 2022-07-05 | Power supply system for display apparatius |
KR10-2022-0082776 | 2022-07-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20240013736A1 true US20240013736A1 (en) | 2024-01-11 |
Family
ID=89368010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US18/213,495 Pending US20240013736A1 (en) | 2022-07-05 | 2023-06-23 | Power supply system for display apparatus |
Country Status (3)
Country | Link |
---|---|
US (1) | US20240013736A1 (en) |
KR (1) | KR20240005538A (en) |
CN (1) | CN117348705A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10091473B1 (en) * | 2017-08-30 | 2018-10-02 | Qisda Corporation | Driver circuit having light source driver at primary side |
US11111720B2 (en) * | 2019-02-08 | 2021-09-07 | Cardinal Ig Company | Low power driver for privacy glazing |
-
2022
- 2022-07-05 KR KR1020220082776A patent/KR20240005538A/en unknown
-
2023
- 2023-06-15 CN CN202310707474.9A patent/CN117348705A/en active Pending
- 2023-06-23 US US18/213,495 patent/US20240013736A1/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10091473B1 (en) * | 2017-08-30 | 2018-10-02 | Qisda Corporation | Driver circuit having light source driver at primary side |
US11111720B2 (en) * | 2019-02-08 | 2021-09-07 | Cardinal Ig Company | Low power driver for privacy glazing |
Also Published As
Publication number | Publication date |
---|---|
KR20240005538A (en) | 2024-01-12 |
CN117348705A (en) | 2024-01-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
TWI404310B (en) | Power management and control module and liquid crystal display device | |
US10354608B2 (en) | Driving circuit of display panel and driving module thereof, and display device and method for manufacturing the same | |
JP4982028B2 (en) | Liquid crystal display device and driving method thereof | |
US8421779B2 (en) | Display and method thereof for signal transmission | |
JP4758332B2 (en) | Liquid crystal display | |
JP5026744B2 (en) | Liquid crystal display | |
TWI570680B (en) | Source driver and method for updating a gamma curve | |
US10235955B2 (en) | Stage circuit and scan driver using the same | |
US8860711B2 (en) | Timing controller and liquid crystal display using the same | |
KR20080058872A (en) | Liquid crystal display, connector for testing liquid crystal display and test method thereof | |
KR20020046661A (en) | Flat Panel Display Apparatus | |
WO2018196084A1 (en) | Scanning drive circuit, array substrate and display panel | |
US20020050968A1 (en) | Display module | |
JP2005222027A (en) | Flat-panel display and its source driver | |
US20090237340A1 (en) | Liquid crystal display module and display system including the same | |
US20070216672A1 (en) | Power driving system and liquid crystal display using same | |
CN107342060B (en) | Drive chip and display device | |
KR20150073642A (en) | Timing controller and display apparatus having the same | |
KR20030061552A (en) | Apparatus and method for transfering data | |
US20240013736A1 (en) | Power supply system for display apparatus | |
CN113539137A (en) | Novel display device and display system | |
US8259059B2 (en) | Driving system capable of improving contrast ratio for liquid crystal display device, liquid crystal display device including the same, and driving method using the same | |
KR100664001B1 (en) | Lighting apparatus formed by serially-driven lighting units | |
US20120181947A1 (en) | Light source driving circuit and display device including the same | |
CN103117050A (en) | Liquid crystal display and compensating circuit for the same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: LX SEMICON CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JANG, WON SUK;NAM, TAE KYU;AHN, YOUNG KOOK;AND OTHERS;SIGNING DATES FROM 20230608 TO 20230609;REEL/FRAME:064044/0265 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS |